Revelation 4:5

4:5 From the throne came out flashes of lightning and roaring and crashes of thunder. Seven flaming torches, which are the seven spirits of God, were burning in front of the throne

Revelation 10:3-4

10:3 Then he shouted in a loud voice like a lion roaring, and when he shouted, the seven thunders sounded their voices. 10:4 When the seven thunders spoke, I was preparing to write, but just then I heard a voice from heaven say, “Seal up what the seven thunders spoke and do not write it down.”

Revelation 11:19

11:19 Then the temple of God in heaven was opened and the ark of his covenant was visible within his temple. And there were flashes of lightning, roaring, crashes of thunder, an earthquake, and a great hailstorm.